diff --git a/lib/base.js b/lib/base.js
index f4ac127f..a1b4eb63 100644
--- a/lib/base.js
+++ b/lib/base.js
@@ -59,7 +59,7 @@ define(
 
       for (var key in this.attrDef.prototype) {
         if (typeof attrs[key]  == 'undefined') {
-          if (this.attr[key] == null) {
+          if (this.attr[key] === null) {
             throw new Error('Required attribute "' + key +
                             '" not specified in attachTo for component "' + this.toString() + '".');
           }